<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <script src="../00.插件/babel.min.js"></script>
  <script src="../00.插件/react.development.js"></script>
  <script src="../00.插件/react-dom.development.js"></script>
  <script src="../00.插件/prop-types.js"></script>
</head>
<body>
<div id="app"></div>
<script type="text/babel">
  /*
    porps是用来做父子组件通信的
      - 在父组件中使用子组件的时候,可以给子组件添加属性
      - 在子组件中组件实例的props属性上,就能拿到这个属性和值

  */
  class Parent extends React.Component{
    state = {
      car:"八手奥拓"
    }
    render(){
      const {car} = this.state;
      return (
        <div>
          <h1>我是父组件</h1>
          <p>我开的车是{car}</p>
          <button onClick={this.changeCarHandle}>股票涨停了,换一辆车</button>
          <hr/>
          <Child a={1} car={car}/>
        </div>
      )
    }

    changeCarHandle = () => {
      this.setState({car:"奥迪RS7"})
    }
  }

  function Child(props){
    const {car} = props;
    return (
      <p>我是儿子组件,我开我老子的车{car}</p>
    )
  }

  //给Child接受的props进行类型限制
  Child.propTypes = {
    a:PropTypes.number.isRequired,
    car:PropTypes.string
  }


  const root = ReactDOM.createRoot(document.getElementById('app'));
  root.render(<Parent/>)




</script>
</body>
</html>